The water supply systems of most buildings make integrated use of 3 types of systems, namely the direct supply system, indirect supply system and sump and pump supply system.
Under the direct supply system, fresh water is transmitted directly from the public water mains to households at lower floors by means of hydraulic pressure inside the
mains.
Under the indirect supply system, a water pump is used to draw water from the storage tank installed at the ground level of the building, and fresh water drawn into the rooftop water tank is then transmitted to each household through a network of sub-mains.
Under the sump and pump supply system, water is transmitted to the receiving end by fitting a pressure pump to the supply, a fire main is one that functions in this way.
A water supply system comprises water pumps, risers,
storage tanks, automatic float switches and sub-mains.
All integral parts of the water supply system should be regularly checked and properly maintained.
All water storage tanks should be cleansed at regular times for quality control.
Enquiries about water supply systems can be directed
to the Water Supplies Department at 2824 5000.